3 BATTERY FUNCTIONS Provide electricity to start the engine*** Provide electrical power to the vehicle when the engine is off Help the alternator if the electrical load exceeds alternator capacity
4 BATTERY CONSTRUCTION PLATES. Separators, connectors, and Electrolyte Positive plates PbO2 Lead oxide Negative plates Pb-lead Separators Element Electrolyte H2SO4+H2O –Sulfuric acid and water –Wet cell Battery case (polypropylene) Terminals (+ LARGER & -) Two dissimilar metals May be charged after discharge
7 PLATE CONSTRUCTION Positive plates and negative plates stacked next to each other. Separators do not allow plates to touch. More powerful batteries simply have more plates
8 BATTERY DISCHARGE CYCLE Acid reacts with plate material Electrolyte increases in water content Positive and Negative plates form lead sulfate Negative terminal has excess electrons Positive terminal has a lack of electrons
9 BATTERY CHARGE CYCLE Alternator forces electrons back into the battery Lead sulfate breaks up Reforms into acid in the electrolyte Amount of water decreases in electrolyte Amount of acid increases in electrolyte
10 Dot –good Dark Green –recharge Yellow –replace Charge Indicators
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